We don't need a C++ compiler to build Blocks, Don't check for one.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@82606 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/BlocksRuntime/CMakeLists.txt b/BlocksRuntime/CMakeLists.txt
index 46b8993..5b4686b 100644
--- a/BlocksRuntime/CMakeLists.txt
+++ b/BlocksRuntime/CMakeLists.txt
@@ -1,4 +1,4 @@
-PROJECT( BlocksRuntime )
+PROJECT( BlocksRuntime C )
 
 SET( SRCS
  runtime.c